DropDown for UWP's key features include the following:
The C1DropDown control gives you complete control to create specialized drop-down editors with ease. Fully design you own drop-down content, and configure which value to display in the header portion. For example, you could place a C1TreeView in the drop-down portion to create a hierarchical combobox that displays the selected node in the header.
Configure the drop-down direction preference to above or below the header portion. If there is not enough room on the page, the C1DropDown control will automatically display in the other direction. With the AutoClose property you can determine if the drop-down automatically closes when the control loses focus.
