ComboBoxRenderer does not look like Windows 7 ComboBox

Question

Hi,
When I call Application.EnableVisualStyles in WinForms application on Windows 7, a ComboBox looks "modern" - it is a white background with a black arrow.  When I do not call EnableVisualStyles, the ComboBox is "legacy" - a gray background.
However, ComboBoxRenderer.DrawDropDownButton always looks "legacy" - it always draws it with a gray background.  I also tried ControlPaint methods but it also looked "legacy."
How do I draw custom combo box button that is "modern" in C# (or even p/Invoke to GDI or GDI+)?
Thanks.

Answer 1

There are 3 DropDownStyles for combobox and each one renders differently.
Below are 3 simple methods to draw a combobox dependant on style and state:
private void DrawSimpleCombo(Graphics graphics, Rectangle bounds, ComboBoxState state)
VisualStyleRenderer renderer;
if (state != ComboBoxState.Disabled)
renderer = new VisualStyleRenderer("COMBOBOX", 4, 2);
renderer.DrawBackground(graphics, bounds);
else
renderer = new VisualStyleRenderer("EDIT", 1, 1);
renderer.DrawBackground(graphics, bounds);
Rectangle rc = renderer.GetBackgroundContentRectangle(graphics, bounds);
rc.Inflate(-2, -2);
graphics.FillRectangle(SystemBrushes.Control, rc);
private void DrawDropDownCombo(Graphics graphics, Rectangle bounds, ComboBoxState state, bool focused)
VisualStyleRenderer renderer = new VisualStyleRenderer("COMBOBOX", 4, state > ComboBoxState.Normal || focused ? 2 : 1);
VisualStyleRenderer buttonRenderer = new VisualStyleRenderer("COMBOBOX", 7, (int)state);
Size szP = buttonRenderer.GetPartSize(graphics, ThemeSizeType.True);
buttonRenderer.SetParameters("COMBOBOX", 7, (int)state);
Size szR = buttonRenderer.GetPartSize(graphics, ThemeSizeType.True);
buttonRenderer.SetParameters("COMBOBOX", 6, (int)state);
Size szL = buttonRenderer.GetPartSize(graphics, ThemeSizeType.True);
Size sz = new Size(szL.Width + szR.Width + szP.Width, szP.Height);
if (state != ComboBoxState.Disabled)
renderer.DrawBackground(graphics, bounds);
else
renderer = new VisualStyleRenderer("EDIT", 1, 1);
renderer.DrawBackground(graphics, bounds);
Rectangle client = renderer.GetBackgroundContentRectangle(graphics, bounds);
client.Inflate(-2, -2);
client.Width -= sz.Width;
graphics.FillRectangle(SystemBrushes.Control, client);
Rectangle rc = Rectangle.FromLTRB(bounds.Right - (sz.Width), bounds.Top, bounds.Right, bounds.Bottom);
buttonRenderer.DrawBackground(graphics, rc);
private void DrawDropDownListCombo(Graphics graphics, Rectangle bounds, ComboBoxState state)
VisualStyleRenderer renderer = new VisualStyleRenderer("COMBOBOX", 5, (int)state);
renderer.DrawBackground(graphics, bounds);
renderer.SetParameters("COMBOBOX", 1, 1);
Size szP = renderer.GetPartSize(graphics, ThemeSizeType.True);
renderer.SetParameters("COMBOBOX", 7, 1);
Size szR = renderer.GetPartSize(graphics, ThemeSizeType.True);
renderer.SetParameters("COMBOBOX", 6, state == ComboBoxState.Disabled ? 4 : 1);
Size szL = renderer.GetPartSize(graphics, ThemeSizeType.True);
Size sz = new Size(szL.Width + szR.Width + szP.Width, szP.Height);
Rectangle rc = Rectangle.FromLTRB(bounds.Right - (sz.Width), bounds.Top, bounds.Right, bounds.Bottom);
renderer.DrawBackground(graphics, rc);
public enum ComboBoxState
Normal = 1, Hot, Pressed, Disabled
Mick Doherty
http://dotnetrix.co.uk
http://glassui.codeplex.com