|It is a Window Style that is supported by "some" Windows Controls.
When set the control sends owner draw messages that can be used to customize the UI of the control to a degree while still leveraging the other behavior and messages of the control.
The owner draw behavior is different for the controls, like Button is different from ListView.
"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum