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custom combobox display issue

P: 4
I built a custom control 'ChooseBox' that inherits from ComboBox. When I select an item from a choosebox control, the selected item does not show up; I mean, the background is blue, but the text is hidden. I have checked my backcolor and forecolor, and don't see anything wrong there. I know this is probably a simple q. Here is the code. Can anybody help?


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using UtilityCode;

namespace WindowsControlLibrary
public class ChooseBox : ComboBox
public ChooseBox()
this.CausesValidation = true;
this.GotFocus += new EventHandler(ChooseBox_GotFocus);
this.LostFocus += new EventHandler(ChooseBox_LostFocus);
this.DropDown += new EventHandler(ChooseBox_DropDown);
this.Font = new Font("Andale Mono", 11F, FontStyle.Regular);
} // constructor

void ChooseBox_GotFocus(object sender, EventArgs e)
this.BackColor = Color.Yellow;
this.Font = new Font(this.Font, FontStyle.Bold);
} // method: GotFocus

void ChooseBox_LostFocus(object sender, EventArgs e)
this.BackColor = Color.White;
this.Font = new Font(this.Font, FontStyle.Regular);
} // method: LostFocus

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
bool retValue = base.ProcessCmdKey(ref msg, keyData);
const int WM_KEYDOWN = 0x100;
const int WM_SYSKEYDOWN = 0x104;
if ((msg.Msg == WM_KEYDOWN) || (msg.Msg == WM_SYSKEYDOWN))
switch (keyData)
case Keys.Down:
retValue = true;

case Keys.Up:
retValue = true;

case Keys.Enter:
retValue = true; // setting retValue =true here prevents a beep
return retValue;
} // method: ProcessCmdKey

void ChooseBox_DropDown(object sender, EventArgs e)
this.BackColor = Color.White;
this.Font = new Font(this.Font, FontStyle.Regular);
Sep 11 '07 #1
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2 Replies

P: 2
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Sep 12 '07 #2

Expert 100+
P: 390
Your code has some where backcolor white.may be that is causing error
Sep 12 '07 #3

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