This is a very basic test control which does nothing more than displaying
it's window text. The text is editable in the styles dialog and the control
should update it's window text accordingly. This does not function in the
dialog editor. In the custom controls preview dialog the ide seems to assign
some text and the control displays it correct. The preview dialog is showed,
if multiple custom control dlls are opened. This can be tested with the
tipofday custom control for example. The comments in the sourcecode
document the expected behaviour.