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is there a possibility to lazy loading the actually not visible columns in a TreeGrid? Because, I have a very big dataset (~1 million rows & several thousand columns) and the load time is too long. It kills the UI... I want to load datas, only if I'm scrolling the treegrid.
How can I lazy loading the columns or what is the recommended method?
not out of the box. Unfortunately I think Grid is generally only designed for a large number rows, not columns - several thousand columns sounds like it won't work. You'll need to look into Grid internals if you want to make that happen, and I suspect it won't be very simple.