I believe they could help you with your day-to-day GWT development so I decided to aggregate them all at this post.
So, here they are:
(NOTE: Please let us know if some of these tips are outdated so that we remove them from the list)
GWT-Ext: How to show tooltips for the ColumnTree (tree-grid, tree-column) widget
How to make GWT – GXT applications testable with Selenium?
GWT – How to draw in the browser with GWTCanvas
GXT – How to select items in non-editable ComboBox by pressing keys
GWT-Ext: How to implement a “Distinct Multiple Filter Columns” grid
GWT-Ext: How to simulate a button using images
GWT-Ext: How to enhance an image with mouse events
GWT-Ext: How to set background color and an image icon in the same grid-cell
GXT: How to change the background color of a TextField
GWT: Configure DevMode “port” and “codeServerPort” options
GWT: Date and Timestamp RPC serialization problem
GXT, GWT Ext – Safe call of the “after render” kind of functions
GXT: How to disable the default behaviour for HOME and END keys in the TabPanel?
GWT: Hidden toolbar doesn’t layout the buttons after it’s made visible
GWT: How to show the wait cursor for long tasks
GWT-Ext: HTML POST request to an URL
GXT: Show / hide the borders, individual, on sides of a panel
GXT: How to set tooltip for a grid cell
GWT: How to change title of the window browser
GWT-Ext: How to set the grid cell background color
GWT: How to open a new window using an URL, not RPC ?
GXT: How to set the grid cell background color
GXT (Ext GWT) – How to maintain selection in a grid even after refresh
GWT – Update the CSS images to be used with the ClientBundles
GXT (Ext GWT) – How can I disable the browser’s default right click response?
GWT-Ext automatically resize GridPanel columns
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