I guess "that" is pretty simple but it depends on what you want to do with it next...
Add a mouse to your layout
And create an event;
On mouse clicked right -> system.create object your block
Then set the blocks position to your mouse.X and mouse.Y in the same event with your block.set position
If you add the dragg behaviour to your block you should be able dragg it around....
But like i said, it really depends on what you are going to do with it afterwards...