capture mouse offset on handle
capture mouse offset on handle

argvader/imagelayers-graph,patocox/imagelayers-graph,Acidburn0zzz/imagelayers-graph,argvader/imagelayers-graph,BWITS/imagelayers-graph,rupakg/imagelayers-graph,CenturyLinkLabs/imagelayers-graph,Acidburn0zzz/imagelayers-graph,argvader/imagelayers-graph,Acidburn0zzz/imagelayers-graph,BWITS/imagelayers-graph,BWITS/imagelayers-graph,patocox/imagelayers-graph,CenturyLinkLabs/imagelayers-graph,rupakg/imagelayers-graph,CenturyLinkLabs/imagelayers-graph,rupakg/imagelayers-graph,patocox/imagelayers-graph