changes the state of this edge to selected state, it means a change in the color
of this edge, calling this method is different to using the select plugin, this is
only changes the state of the edge
determines whether show changes in model to view, for example when an algorithm changes the color of a vertex
in VertexModel(BaseVertex) should a color be assigned in GUI to it or not?
opens a browser window to report a bug to server
## it is also possible to have a more control on the opening page, the operation are similar to ExceptionReport
shows a message in the status bar of the Frame loaded and assigned to current blackboard
note that at each time just 1 message can be shown on that place
starts the process of selecting a rectangular region by the user on the graph
this will listen for press the mouse button and drag it on the graph
this will finished whenever the mouse released
converts a String that generated with standard toString() of a font object to a Font Object
a sample input is: "java.awt.Font[family=Dialog,name=tahoma,style=plain,size=12]"