How to select shapes from a layer by user-defined shape (circle and rectangle in this samples).
This sample illustrates use of:
|Clears selection of all shapes.
|Reverts all shapes to their original state.
|Creates a new shape and makes it editable.
|Finds the first shape in layer.
|Finds the next occurrence of an item defined in FindFirst.
|Add next part to the shape.
|Add a point to the last part of the shape.
|Compute a buffer around a shape to a given distance.