protected override void OnHandleDestroyed(EventArgs e)
{
if (this._textBoxWindow != null)
{
this._textBoxWindow.ReleaseHandle();
this._textBoxWindow = null;
}
base.OnHandleDestroyed(e);
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
if (base.DropDownStyle == ComboBoxStyle.DropDown)
{
IntPtr window = Interop.GetWindow(base.Handle, 5);
if (window != IntPtr.Zero)
{
this._textBoxWindow = new ChildTextBoxWindow(this);
this._textBoxWindow.AssignHandle(window);
}
}
this.UpdateShowInitialText();
}