When trying to demonstrate transformations with Geogebra from the board, I have not been able to make Geogebra perform the operation chosen (E.g. Reflect triangle ABC in line y=x). To perform the transformation in Geogebra you select the reflection tool, then select the object and then the line. At the computer, using the mouse, the object automatically remains selected when the line is selected. At the board, using the pen, this does not happen. It seems to be a problem associated with the ability to make multiple selection of items on the screen.
Any advice or guidane would be much appreciated.
Many thanks in anticipation.