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ToolTip Show(...) Method - And External Objects

Hello. I'm trying to display a tooltip to an external window. I have a wrapper class
public class WindowWrapper : System.Windows. Forms.IWin32Win dow {
public WindowWrapper(I ntPtr handle) { _hwnd = handle; }
public IntPtr Handle { get { return _hwnd; } }
private IntPtr _hwnd;

But when I call the following

ToolTip tt = new ToolTip();
tt.ShowAlways = true;
tt.Show("Hello" , new WindowWrapper(h Wnd), 100, 100);

I get a "NullObjectRefe rence Exception" - Object reference not set to an instance of an object. at System.Windows. Forms.ToolTip.I sWindowActive(I Win32Window window)

I can however call

MessageBox.Show (new WindowWrapper(h Wnd), "Hello World!");

and a MessageBox shows fine. I can't even get ToolTip method (using show(..)) to work with non-external objects (using the WindowWrapper). Is there something I'm doing wrong or just can't do this with tooltips?

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Jan 11 '06 #1
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