Transparent background problem

[David Veeneman]

I have created several UserControls with transparent backgrounds. To enable
transparency, I've added the following statement to the constructor for each
control:

this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);

On most of the controls, transpanency works fine. But on a couple of
controls, the transparent area is black. I tried adding this statement to
fix the problem, immediately above the preceding statement:

this.SetStyle(ControlStyles.UserPaint, true);

I'm still having the same problem.

Any ideas why the transparent area is drawing black? How do I fix this?
Thanks in advance.

David Veeneman
Foresight Systems

 

[Herfried K. Wagner [MVP]]

I have created several UserControls with transparent backgrounds. To enable
transparency, I've added the following statement to the constructor for
each control:

this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);

Creating transparent controls that can handle mouse events
<URL:http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en>

 

[David Veeneman]

I found the cause of my problem. In some of the controls, I had included the
following statement:

grfx.Clear(this.BackColor);

When I removed this line from the controls, transparency worked fine.

David Veeneman
Foresight Systems