I've found a solution.. Provided that I at the start move the Condition levers by hand first and place them back at the taxi indent, I can then use the control on my Joystick to further use the condition levers. The condition lever lock is touchie. To be able to move the condition levers with the mouse, I have to move the lock up and back down first otherwise the mouse will not move the condition levers (ie no symbol that enables the movement). Also notified in another post.