The Boundary property specifies the boundary of the element when user drags it. The boundary option restricts the movement of the element when it is being dragged by the user. By default, the boundary is set to exNone, which means that the element can be dragged anywhere. The boundary can be set to other values to restrict the movement of the element within its pool, lane, phase, or intersection of lane and phase.

The boundary is defined as a value of ElementBoundaryEnum type, which can be one of the following:

• exNone, indicates that the element can be dragged anywhere
• exPool, indicates that the element can be dragged only within its pool (the element can be dragged to other lanes and phases within the same pool)
• exLane, indicates that the element can be dragged only within its lane (the element can be dragged to other phases within the same lane)
• exPhase, indicates that the element can be dragged only within its phase (the element cannot be dragged to other lanes or phases)
• exInside, indicates that the element can be dragged only within the intersection of lane and phase (the element cannot be dragged to other lanes or phases)

The X property of the element is used to determine the horizontal position of the element, and the Y property of the element is used to determine the vertical position of the element. The Width and Height properties of the element are used to determine the size of the element.