We are using a combination of GWT and Ext-GWT 3.0 and we are in the process of converting from GXT 2.1 to Ext-GWT 3.0. The application uses a 3.0 grid with various columns to represent the data. One of the columns contains an icon which when moused over should display an image as a tooltip with other server retrieved details displayed as well. That column now uses an AbstractCell to display the image tooltip which works fine. But, we had previously used a callback method in 2.1 using htmlContainer where we would retrieve data from the server and display it above and below the image tooltip. AbstractCell has a render method but the server data has to be retrieved before the render takes place. I am not sure how to incorporate this callback method into AbstractCell and/or the grid. The model data we need is passed into the render method for AbstractCell.
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