Template Grids are not editable. Try a ListView with a snippet to provide editability and searching. FYI, searching in a ListView is a 'combo box' approach. One search field will search across all of the searchable attributes.
Though it is recommended to use the list view, there is an option to use the formloader, the old fashion of the snippet.
In some cases; like refresh issue, having multiple columns and paging are not available in the list view
If you like to have the real solution, vote up the (second) post in the IDEA topic, https://forum.mendix.com/questions/8061/Idea-Forum--Q2-2015--OPEN