To add a new element – a circle, the button 
of the mode toolbar is used.
The user can specify the place in the editing pane where the circle should be placed and its size. For this purpose one should press the left mouse button in one of the corners of the square inside of which the circle will be located and specify the size of the circle moving the cursor.
An ellipse is added similarly to adding a circle, but in this case the button 
of the mode toolbar is used and location region can have a rectangular, not a square form. The axes of the ellipse are always parallel to coordinate axes.
A rectangle is added similarly to adding an ellipse, but the button 
of the mode toolbar is used.
The added element becomes the selected element of the layout. The user can change the element style using the command Element+Properties.
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