Thanks Peer, maybe exist an better solution, but in my case the following code seems to work...
Function GUI_EditText (PosX, PosY, Message$, MinLength, MaxLength, Value$, hImage) Elapsedtime = MilliSecs() GUI_Display_text (PosX,PosY, Message$ + Value$) While Not KeyDown (28) And Len(Value$) >= MinLength Flip If (MilliSecs() > Elapsedtime + 50) Then Elapsedtime = MilliSecs() If KeyDown(14) Then If Len(Value$) > 0 Then Value$ = Left$(Value$, Len(Value$) -1) End If Else KeyValue = GetKey() Char$ = Chr$(KeyValue) If Len(Value$) < MaxLength Then If (KeyValue => 48 And KeyValue <=57) Or (KeyValue => 65 And KeyValue <= 90) Or (KeyValue => 97 And KeyValue <= 122) Then Value$ = Value$ + Lower(Char$) Else ; If Not ( KeyDown (14) Or KeyDown(28)) Then play a sound End If End If End If End If If Len(Value$) <= (MinLength-1) And KeyDown (28) Then ; play a sound !!! End If DrawImage hImage, 0, 0 GUI_Display_text (PosX, PosY, Message$ + Value$ + "|") Wend End Function