dialogBox->pack_start(widget_rend_desc, false, false, 0);
canvas_interface_->signal_rend_desc_changed().connect(sigc::mem_fun(*this,&studio::CanvasProperties::refresh));
dialogBox->pack_start(widget_rend_desc, false, false, 0);
canvas_interface_->signal_rend_desc_changed().connect(sigc::mem_fun(*this,&studio::CanvasProperties::refresh));