Use Align to align a control to the top, bottom, left, or right of a popup container and have it remain there even if the size of the popup container changes. When the parent is resized, an aligned control also resizes so that it continues to span the top, bottom, left, or right edge of the parent. 

This property is mirror of Control.Align property. Some controls do not publish its Align property, so this wrapper allows defining Align at design time.

TecControlItem Properties