Question

How to change dropdown button in a ComboBox control (C#, Windows Forms)? I have a custom button, and I want to use it in the ComboBox instead of the default dropdown button.

Answer 1

I think Hans Passant solution is the way…

From here:

http://social.msdn.microsoft.com/forums/en-US/winformsdesigner/thread/5d65f987-834c-465f-a944-622831d4cfb0

You can create a UserControl, drag a
ComboBox and a Button onto it, make
the Button right over the ComboBox’s
arrow button to make the arrow button
invisible, handle the Button’s Paint
event to draw an arrow on it, this can
be done by calling
ComboBoxRenderer.DrawDropDownButton()
method (Notice: this method has a
limit, it needs the visual style being
enabled on the OS) or by drawing an
icon on it, or just drawing a small
triangle on it.
Then handle the Click event of the button to show the ComboBox’s
DropDown, this can be done by
something like this

    private void button1_Click(object sender, EventArgs e)
    {
        this.comboBox1.DroppedDown = true;
    }