在存储加载时，extjs在面板上显示loadmask

I added a loadmask to a panel and I want the spinner to be displayed each time stores associated with the loadmask are loaded. The panel is a large tooltip and the stores are loaded each time a point is visited in a line chart. Thus, when I hover over a point, I'm expecting a load message to appear for a short period of time before I see the contents in the panel. What I'm getting is an empty panel however. If I remove the code that I have which adds the load mask (the initComponent function), it works (without the load message though). How would I use the loadmask in this manner as opposed to explicitly calling the setLoading() method for each panel?I added a loadmask to a panel and I want the sp