How to assign a function or property to all other classes, like ToolTip

When I drag an object ToolTipin my form into C #, each form control gets a new property ToolTipthat did not exist before. I am trying to create something like this ToolTipso that when dragging it into my form all controls automatically get a new property.

I would also appreciate if someone could give me a definition for this, so that I could edit my question to convey my intention and meaning better.