Finding source of an invalid cast

[timppl]

Hello all

A while ago I posted about an invalid cast  http://lazarus.freepascal.org/index.php/topic,17736.msg98671.html#msg98671 . I have done a bit more investigation, and with the command

Code: [Select]

writeln ( 'Object type is ' , LCLObject.ClassName ); at gtk2CellRenderer line 95 the following output appears

(SPECTRA:32126): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed

(SPECTRA:32126): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed
Object type is TComboBox.

As you can see, the object is a TComboBox, and the command ( at line 96 )

Code: [Select]

Result := LCLObject as TWinControl;should succeed, but fails with an invalid cast exception.

Any suggestions as to how I can find the name of the offending component?

using Laz + fpc from svn each day on mandriva linux

Regards

Tim