Valid only when Fill=False. Thickness of the line used to draw the rectangle. NORMAL_LINE will be 1 pixel wide. THICK_LINE will be 3 pixels wide (GOL definitions).
Valid only when Fill=False. Type of the line used to draw the rectangle, between SOLID_LINE, DOTTED_LINE and DASHED_LINE (GOL definitions).
The Zorder of the Widget
Being 1-dimensional, the Line primitive doesn't fit in the 2-dimensional designing architecture of VGDD. So to change Line's inclination you must use this design-only property, which actually swaps the X1 and X2 coordinates.