Lasso Layer
The lasso layer provides the necessary infrastructure to display a selection lasso, which is basically a rectangle that gets created when the user performs a mouse drag operation with the SHIFT key down (pressing the CTRL key at the same time allows for multiple selections). The layer can be configured to either select the timeline objects with which the lasso intersects or the time span represented by the start and with of the rectangle. Selected time spans are added to the selection model of the layer container.
Lasso Selection
Relevant API
void LassoLayer.setSelectionMode(SelectionMode mode);
SelectionModeAction
ILayerContainerSelectionModel