Control Properties Tab
The Properties tab lists the values associated with a graphical control / prompt once its placed on the form.
These controls have relationships to other objects in the Solution Explorer. For example, there are parent-child relationships between forms and pages, and between controls and other controls. This enables you to change or move multiple objects instantly through a parent “Owner” object.
Mobile Themes and Controls. By default, the parent "Element" (i.e. ListBox Control) in Mobile Themes sets the look and feel values for the corresponding control assigned to a an application form in Applications. For example if the value = "(Default)" this means its inheriting the value set in Mobile Themes. If you set the value locally (in the Properties tab) it will override the value set by in Mobile Themes. You may also see "Control Default" used.
Note: Since you can have multiple Mobile Themes, make sure you check which is the Active Theme being applied before you make changes on the Control tab. Click on File > Active Theme.