1. One or more computer-readable media having computer-executable instructions embodied thereon that, when executed, perform a method for initiating a presentation action utilizing a drag-operation on a graphical user interface (GUI) rendered at a touchscreen display, the method comprising: detecting a user-initiated input applied at a top-level control button; recognizing the user-initiated input as a drag-operation by disambiguating the drag-operation from a tap-type operation based on a distance of an uninterrupted drag-movement from a location of actuation of the user-initiated input at the touchscreen display, wherein the tap-type operation, when applied to the top-level control button, initiates a principal action mapped to the top-level control button; incident to recognizing that the drag-operation is applied at the top-level control button, invoking the presentation action, wherein the presentation action is mapped to the top-level control button; and rendering an indication of the presentation action at the GUI.