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)

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

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

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