I have subclassed DataGridColumn but for some reason it does not render in design mode. Compiles and runs fine, no problem there.
All myDataGridColumn has is a couple extra properties. No code, no overrides, except for a call to super() in the constructor. I checked DataGridColumn's source and found no special metadata. Is there anything special that needs to be added/set in design.xml? btw, I checked the SDK's design.xml and did not see any reference to DataGridColumn. Any help greatly appreciated TIA julio btw: using sdk 3.2, FB 3.0.2