Why the **BlocksToolkit** is in the Properties pane instead of the Component Palette?

Hi All,
Just a question: why the BlocksToolkit is in the Properties pane instead of the Component Palette? After all is just a filter of components to show… IMHO must be moved to the Palette section because it isn’t a Property of screen1 but a filter.

In Access, Excel, and other sw each filter is at the top of the respective column. It is more logic to find a filter for the palette component at the top of the palette…