If none, when in a grid, the control will fill the entire cell

If true (default) we'll include a label next to the control

If true we prefer to be full inspector width with the label above us

Called when right clicking a label in a ControlSheet for this widget. This allows you to add advanced menu items for this widget at the top of the menu, before the default ones.

Should get called right after creation

Selects this widget and starts editing. Used when we want to focus on the widget in the inspector, like when double-clicking on something in a graph editor that maps to this widget.