Just like in the case of RadCheckBox, RadToggleButton has a few states. Therefore, we need to add the possibility in Visual Style Builder to style the RadToggleButton when it is disabled and taking into consideration the toggle state (on/off)

When a RadCheckBox is in Indeterminate state, the user should be able to see a square instead of checkmark.

Add DefaultItem property in the property grid and allow to set it in design time

IMPROVE. RadCheckBox - one should be able to increase the size of the check box and the check mark