diff --git a/csrc/mui.c b/csrc/mui.c
index 36d3b117..edb8469e 100644
--- a/csrc/mui.c
+++ b/csrc/mui.c
@@ -567,14 +567,15 @@ uint8_t mui_task_read_nth_seleectable_field(mui_t *ui)
 
 /* === utility functions for the user API === */
 
-void mui_send_cursor_msg(mui_t *ui, uint8_t msg)
+uint8_t mui_send_cursor_msg(mui_t *ui, uint8_t msg)
 {
   if ( ui->cursor_focus_fds )
   {
     ui->fds = ui->cursor_focus_fds;
     if ( mui_prepare_current_field(ui) )
-      muif_get_cb(ui->uif)(ui, msg);
+      return muif_get_cb(ui->uif)(ui, msg);
   }
+  return 0; /* not called, msg not handled */
 }
 
 /* === user API === */
@@ -725,6 +726,8 @@ void mui_RestoreForm(mui_t *ui)
 */
 void mui_NextField(mui_t *ui)
 {
+  if ( mui_send_cursor_msg(ui, MUIF_MSG_EVENT_NEXT) )
+    return;
   mui_send_cursor_msg(ui, MUIF_MSG_CURSOR_LEAVE);
   mui_next_field(ui);
   mui_send_cursor_msg(ui, MUIF_MSG_CURSOR_ENTER);
@@ -738,6 +741,8 @@ void mui_NextField(mui_t *ui)
 */
 void mui_PrevField(mui_t *ui)
 {
+  if ( mui_send_cursor_msg(ui, MUIF_MSG_EVENT_PREV) )
+    return;
   mui_send_cursor_msg(ui, MUIF_MSG_CURSOR_LEAVE);
   
   mui_loop_over_form(ui, mui_task_find_prev_cursor_uif);
diff --git a/csrc/mui.h b/csrc/mui.h
index 18706197..b03b70ff 100644
--- a/csrc/mui.h
+++ b/csrc/mui.h
@@ -151,7 +151,8 @@ struct muif_struct
 #define MUIF_MSG_CURSOR_LEAVE 6
 #define MUIF_MSG_TOUCH_DOWN 7
 #define MUIF_MSG_TOUCH_UP 8
-
+#define MUIF_MSG_EVENT_NEXT 9
+#define MUIF_MSG_EVENT_PREV 10
 
 /* dynamic flags */
 #define MUIF_DFLAG_IS_CURSOR_FOCUS 0x01
@@ -181,6 +182,8 @@ struct mui_struct
   
   //uint8_t selected_value;   // This variable is not used by the user interface but can be used by any field function
   uint8_t tmp8;
+  
+  uint8_t curr_focus_field_tmp;         // a temp variable which can be used by the field which has the current focus
   /* current field/style variables */
   //uint8_t cursor_focus_position;        // the index of the field which has focus, can be used as last argument for mui_EnterForm
   
diff --git a/csrc/mui_u8g2.c b/csrc/mui_u8g2.c
index 60ecb7b9..2c6cdee8 100644
--- a/csrc/mui_u8g2.c
+++ b/csrc/mui_u8g2.c
@@ -790,10 +790,8 @@ uint8_t mui_input_uint8_invers_select_u8g2(mui_t *ui, uint8_t msg)
       if ( mui_IsCursorFocus(ui) )
       {
         flags |= U8G2_BTN_INV;
-      }
-      
+      }      
       u8g2_DrawButtonUTF8(u8g2, mui_get_x(ui), mui_get_y(ui), flags, u8g2_GetStrWidth(u8g2, "9"), 1, 1, buf);
-      
       break;
     case MUIF_MSG_FORM_START:
       break;
@@ -815,6 +813,91 @@ uint8_t mui_input_uint8_invers_select_u8g2(mui_t *ui, uint8_t msg)
   return 0;
 }
 
+uint8_t mui_is_valid_char(uint8_t c)
+{
+  if ( c == 32 )
+    return 1;
+  if ( c >= 'A' && c <= 'Z' )
+    return 1;
+  if ( c >= 'a' && c <= 'z' )
+    return 1;
+  if ( c >= '0' && c <= '9' )
+    return 1;
+  return 0;
+}
+
+uint8_t mui_input_char_invers_select_u8g2(mui_t *ui, uint8_t msg)
+{
+  //ui->dflags                          MUIF_DFLAG_IS_CURSOR_FOCUS       MUIF_DFLAG_IS_TOUCH_FOCUS
+  //mui_get_cflags(ui->uif)       MUIF_CFLAG_IS_CURSOR_SELECTABLE
+  u8g2_t *u8g2 = mui_get_U8g2(ui);
+  u8g2_uint_t flags = 0;
+  uint8_t *value = (uint8_t *)muif_get_data(ui->uif);
+  char buf[6];
+  switch(msg)
+  {
+    case MUIF_MSG_DRAW:
+      while( mui_is_valid_char(*value) == 0 )
+          (*value)++;
+      buf[0] = *value;
+      buf[1] = '\0';
+      if ( mui_IsCursorFocus(ui) )
+      {
+        flags |= U8G2_BTN_INV;
+        if ( ui->curr_focus_field_tmp )
+        {
+          flags |= U8G2_BTN_XFRAME;
+        }      
+      }      
+      u8g2_DrawButtonUTF8(u8g2, mui_get_x(ui), mui_get_y(ui), flags, u8g2_GetStrWidth(u8g2, "W"), 1, 1, buf);
+      break;
+    case MUIF_MSG_FORM_START:
+      break;
+    case MUIF_MSG_FORM_END:
+      break;
+    case MUIF_MSG_CURSOR_ENTER:
+      /* 0: normal mode, 1: capture next/prev mode */
+      ui->curr_focus_field_tmp = 0;
+      break;
+    case MUIF_MSG_CURSOR_SELECT:
+      /* toggle between normal mode and capture next/prev mode */
+      if ( ui->curr_focus_field_tmp )
+        ui->curr_focus_field_tmp = 0;
+      else
+        ui->curr_focus_field_tmp = 1;
+      break;
+    case MUIF_MSG_CURSOR_LEAVE:
+      break;
+    case MUIF_MSG_TOUCH_DOWN:
+      break;
+    case MUIF_MSG_TOUCH_UP:
+      break;
+    case MUIF_MSG_EVENT_NEXT:
+      if ( ui->curr_focus_field_tmp )
+      {
+        do {
+          (*value)++;
+        } while( mui_is_valid_char(*value) == 0 );
+        return 1;
+      }
+      break;
+    case MUIF_MSG_EVENT_PREV:
+      if ( ui->curr_focus_field_tmp )
+      {
+        do {
+          (*value)--;
+        } while( mui_is_valid_char(*value) == 0 );
+        return 1;
+      }
+      break;
+  }
+  return 0;
+}
+
+
+
+
+
 /*
 
   uint8_t mui_single_line_option_invers_select_u8g2(mui_t *ui, uint8_t msg)
diff --git a/csrc/mui_u8g2.h b/csrc/mui_u8g2.h
index 2143bf36..9bead8c0 100644
--- a/csrc/mui_u8g2.h
+++ b/csrc/mui_u8g2.h
@@ -68,6 +68,7 @@ uint8_t mui_goto_half_width_frame_button_invers_select_u8g2(mui_t *ui, uint8_t m
 uint8_t mui_goto_line_button_invers_select_u8g2(mui_t *ui, uint8_t msg);
 
 uint8_t mui_leave_menu_frame_button_invers_select_u8g2(mui_t *ui, uint8_t msg);
+
 uint8_t mui_input_uint8_invers_select_u8g2(mui_t *ui, uint8_t msg);
 uint8_t mui_single_line_option_invers_select_u8g2(mui_t *ui, uint8_t msg);
 
@@ -77,6 +78,9 @@ uint8_t mui_select_options_child_invers_select_u8g2(mui_t *ui, uint8_t msg);
 uint8_t mui_checkbox_invers_select_u8g2(mui_t *ui, uint8_t msg);
 uint8_t mui_radio_invers_select_u8g2(mui_t *ui, uint8_t msg);
 
+
+uint8_t mui_input_char_invers_select_u8g2(mui_t *ui, uint8_t msg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/csrc/u8g2.h b/csrc/u8g2.h
index 21244896..576d6180 100644
--- a/csrc/u8g2.h
+++ b/csrc/u8g2.h
@@ -1463,6 +1463,9 @@ void u8g2_DrawRFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t w,
 /* horizontal center */
 #define U8G2_BTN_HCENTER 0x40
 
+/* second one pixel frame */
+#define U8G2_BTN_XFRAME 0x80
+
 void u8g2_DrawButtonFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t flags, u8g2_uint_t text_width, u8g2_uint_t padding_h, u8g2_uint_t padding_v);
 void u8g2_DrawButtonUTF8(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t flags, u8g2_uint_t width, u8g2_uint_t padding_h, u8g2_uint_t padding_v, const char *text);
 
diff --git a/csrc/u8g2_button.c b/csrc/u8g2_button.c
index 1cdb9172..3c8429d5 100644
--- a/csrc/u8g2_button.c
+++ b/csrc/u8g2_button.c
@@ -84,11 +84,15 @@
 
     U8G2_BTN_HCENTER 0x40
 
+    U8G2_BTN_XFRAME 0x80
 
   Total size without shadow: width+2*padding_h+2*border
   Total size with U8G2_BTN_SHADOW0: width+2*padding_h+3*border
   Total size with U8G2_BTN_SHADOW1: width+2*padding_h+3*border+1
   Total size with U8G2_BTN_SHADOW2: width+2*padding_h+3*border+2
+  
+  U8G2_BTN_XFRAME:
+    draw another one pixel frame with one pixel gap, will not look good with shadow
 */
 
 void u8g2_DrawButtonFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t flags, u8g2_uint_t text_width, u8g2_uint_t padding_h, u8g2_uint_t padding_v)
@@ -97,11 +101,25 @@ void u8g2_DrawButtonFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_
   
   u8g2_uint_t xx, yy, ww, hh;
   
+  u8g2_uint_t gap_frame = U8G2_BTN_BW_MASK+1;
+    
   u8g2_uint_t border_width = flags & U8G2_BTN_BW_MASK;
 
   int8_t a = u8g2_GetAscent(u8g2);
   int8_t d = u8g2_GetDescent(u8g2);
   
+  uint8_t color_backup = u8g2->draw_color;
+  
+  
+  if ( flags & U8G2_BTN_XFRAME )
+  {
+    border_width++;
+    gap_frame = border_width;
+    border_width++;
+  }
+  
+
+  
   for(;;)
   {
 
@@ -118,7 +136,12 @@ void u8g2_DrawButtonFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_
     hh = a-d+2*padding_v+2*border_width;
     if ( border_width == 0 )
       break;
+    if ( border_width == gap_frame )
+    {
+      u8g2_SetDrawColor(u8g2, color_backup == 0 ? 1 : 0);
+    }
     u8g2_DrawFrame(u8g2, xx, yy, ww, hh);
+    u8g2_SetDrawColor(u8g2, color_backup);
     
     if ( flags & U8G2_BTN_SHADOW_MASK )
     {
@@ -139,7 +162,6 @@ void u8g2_DrawButtonFrame(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_
   
   if ( flags & U8G2_BTN_INV )
   {
-    uint8_t color_backup = u8g2->draw_color;
     u8g2_SetDrawColor(u8g2, 2);         /* XOR */
     u8g2_DrawBox(u8g2, xx, yy, ww, hh);
     u8g2_SetDrawColor(u8g2, color_backup);
diff --git a/sys/sdl/mui/main.c b/sys/sdl/mui/main.c
index d9c8ad8c..6cf2f1d5 100644
--- a/sys/sdl/mui/main.c
+++ b/sys/sdl/mui/main.c
@@ -58,6 +58,7 @@ uint8_t my_value3 = 0;
 uint8_t color_input = 0;
 uint8_t checkbox_input = 0;
 uint8_t direction_input = 0;
+uint8_t text_input[4] = { ' ',' ',' ',' '} ;
 uint8_t exit_code = 0;
 
 
@@ -93,6 +94,12 @@ muif_t muif_list[] = {
   
   /* input for a number between 0 to 9 */
   MUIF("IN",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&number_input,mui_input_uint8_invers_select_u8g2),
+
+  /* input for text with four chars  */
+  MUIF("T0",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&text_input+0,mui_input_char_invers_select_u8g2),
+  MUIF("T1",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&text_input+1,mui_input_char_invers_select_u8g2),
+  MUIF("T2",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&text_input+2,mui_input_char_invers_select_u8g2),
+  MUIF("T3",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&text_input+3,mui_input_char_invers_select_u8g2),
   
   /* input for a fruit (0..3), implements a selection, where the user can cycle through the options  */
   MUIF("IF",MUIF_CFLAG_IS_CURSOR_SELECTABLE,&fruit_input,mui_single_line_option_invers_select_u8g2),
@@ -142,15 +149,24 @@ muif_t muif_list[] = {
 fds_t fds[] = 
 
 /* top level main menu */
-MUI_FORM(1)
+MUI_FORM(0)
 MUI_STYLE(1)
-MUI_LABEL(5,10, "Main Menu")
+MUI_LABEL(5,10, "Main Menu 1/2")
 MUI_XY("HR", 0,13)
 MUI_STYLE(0)
 MUI_GOTO(5,25,10, "Enter a number")
 MUI_GOTO(5,36,11, "Selection/Combo Box")
 MUI_GOTO(5,47,13, "Checkbox")
-MUI_GOTO(5,58,14, "Radio Selection")
+MUI_GOTO(5,58,1, "More...")
+
+MUI_FORM(1)
+MUI_STYLE(1)
+MUI_LABEL(5,10, "Main Menu 2/2")
+MUI_XY("HR", 0,13)
+MUI_STYLE(0)
+MUI_GOTO(5,25,14, "Radio Selection")
+MUI_GOTO(5,36,15, "Text Input")
+MUI_GOTO(5,58,0, "Back...")
 
 /* number entry demo */
 MUI_FORM(10)
@@ -162,7 +178,7 @@ MUI_STYLE(0)
 MUI_LABEL(5,30, "Number:")
 MUI_XY("IN",50, 30)
 
-MUI_XYAT("G1",64, 59, 1, " OK ")
+MUI_XYAT("G1",64, 59, 0, " OK ")
 
 /* selection / combo box */
 MUI_FORM(11)
@@ -177,7 +193,7 @@ MUI_XYAT("IF",50, 29, 60, "Banana|Apple|Melon|Cranberry")
 MUI_LABEL(5,43, "Color:")
 MUI_XYAT("IC",50, 43, 12, "red|green|blue")     /* jump to sub form 12 */
 
-MUI_XYAT("G1",64, 59, 1, " OK ")
+MUI_XYAT("G1",64, 59, 0, " OK ")
 
 /* combo box color selection */
 MUI_FORM(12)
@@ -199,7 +215,7 @@ MUI_STYLE(0)
 MUI_LABEL(5,30, "Checkbox:")
 MUI_XY("CB",60, 30)
 
-MUI_XYAT("G1",64, 59, 1, " OK ")
+MUI_XYAT("G1",64, 59, 0, " OK ")
 
 /* Radio selection demo */
 MUI_FORM(14)
@@ -214,8 +230,22 @@ MUI_XYAT("RS",10, 40,1,"South")
 MUI_XYAT("RS",65, 28,2,"East")
 MUI_XYAT("RS",65, 40,3,"West")
 
-MUI_XYAT("G1",64, 59, 1, " OK ")
+MUI_XYAT("G1",64, 59, 0, " OK ")
 
+/* number entry demo */
+MUI_FORM(15)
+MUI_STYLE(1)
+MUI_LABEL(5,10, "Number 0..9 Menu")
+MUI_XY("HR", 0,13)
+MUI_STYLE(0)
+
+MUI_LABEL(5,30, "Text:")
+MUI_XY("T0",40, 30)
+MUI_XY("T1",50, 30)
+MUI_XY("T2",60, 30)
+MUI_XY("T3",70, 30)
+
+MUI_XYAT("G1",64, 59, 0, " OK ")
 
 /* minimal example */
 MUI_FORM(200)
@@ -263,7 +293,8 @@ int main(void)
   u8x8_ConnectBitmapToU8x8(u8g2_GetU8x8(&u8g2));		/* connect to bitmap */
   
   mui_Init(&ui, &u8g2, fds, muif_list, sizeof(muif_list)/sizeof(muif_t));
-  mui_GotoForm(&ui, 201, 0);
+  //mui_GotoForm(&ui, 201, 0);
+  mui_GotoForm(&ui, 0, 0);
 
   //puts(fds);
   
diff --git a/sys/sdl/ui/main.c b/sys/sdl/ui/main.c
index 898008e5..d89e30b9 100644
--- a/sys/sdl/ui/main.c
+++ b/sys/sdl/ui/main.c
@@ -35,12 +35,13 @@ MUIF(".g",MUIF_CFLAG_IS_CURSOR_SELECTABLE,0,mui_goto_line_button_invers_select_u
 MUIF(".L",0,0,mui_label_u8g2)
 };
 
-fds_t fds = 
+fds_t *fds = 
 
 MUI_FORM(1)
 MUI_goto(12,10,2, "Test 1")
 MUI_goto(12,22,10, "Button Test")
-MUI_goto(12,34,101, "Story")
+MUI_goto(12,34,20, "Button Test 2")
+MUI_goto(12,46,101, "Story")
 
 MUI_FORM(2)
 MUI_LABEL(0,10, "Number:")
@@ -89,6 +90,9 @@ MUI_FORM(16)
 MUI_goto(10,61,10, "Back")
 
 
+MUI_FORM(20)
+MUI_goto(10,61,10, "Back")
+
 MUI_FORM(101)
 MUI_LABEL(0, 10, "Robot enabled.")
 MUI_LABEL(0, 20, "KI activated.")
@@ -180,7 +184,7 @@ int main(void)
   
   
   mui_Init(&ui, &u8g2, fds, muif_list, sizeof(muif_list)/sizeof(muif_t));
-  mui_EnterForm(&ui, 0);
+  mui_GotoForm(&ui, 1, 0);
 
   puts(fds);
   
@@ -260,6 +264,12 @@ int main(void)
         u8g2_DrawButtonUTF8(&u8g2, 8-4, 22, /*flags*/U8G2_BTN_INV, /*w*/ 112+4*2, /*ph*/ 4,  /*pv*/0, "Line");
         u8g2_DrawButtonUTF8(&u8g2, x, 35, /*flags*/U8G2_BTN_INV, /*w*/ 128-2*x, /*ph*/ x,  /*pv*/0, "Line");
       }
+
+      if ( ui.current_form_fds[1] == 20 )
+      {
+        u8g2_DrawButtonUTF8(&u8g2, 64, 12, /*flags*/U8G2_BTN_HCENTER|U8G2_BTN_XFRAME, /*w*/ 0, /*ph*/ 0,  /*pv*/0, "Center W0");
+        u8g2_DrawButtonUTF8(&u8g2, 64, 28, /*flags*/U8G2_BTN_HCENTER|U8G2_BTN_XFRAME|U8G2_BTN_INV, /*w*/ 0, /*ph*/ 0,  /*pv*/0, "Center W0 Inv");
+      }
       
       //u8g2_DrawBox(&u8g2, 10, 10+y, 20, x);
       //u8g2_DrawFrame(&u8g2, 34, 10+y, 20, x);