Add Text property to the BasicComboBoxItem
Add Text, IsReadonly, IsExpanded, VerticalScrollPercent, VerticalViewSize and VerticallyScrollable to the BasicComboBox
Add method to the BasicComboBox to find a BasicComboBoxItem child control, even it is virtualized and it needs to be scrolled
Add unsafe methods Expand, Collapse, SetValue, SetScrollPercent and ScrollVertical to the BasicComboBox
Add Text property to the BasicCheckBox
Add unsafe toggle method to the BasicCheckBox
Add application parameter possibility to the ApplicationFactory
Add HasExited to the TestableApplication