Are there any known issues with the ExtJS RowExpander plugin when working in ExtJS 4.0? I get errors that createDelegate is not a function. Is it removed in Ext 4.0? Are there any better alternatives for nested grids in this library?
rowexpander did not work in 4.0.2, but they fixed it for 4.0.4+, though.
Emily is right, check out this thread:
http://www.sencha.com/forum/showthread.php?137418-RowExpander-doesn-t-work-on-ExtJs-4.0.2-(ext-all-debug.js)-but-worked-on- (ext-all.js )
for more details (it offers a workaround that can be used for version 4.0.2).