Summary row and remove icon

[pH4Lk0n]

Hello,

I'm wondering what is the purpose of remove icon that shows on summary row of ListGrid??

ListGrid queueList = new ListGrid();
queueList.setCanRemoveRecords(true);
queueList.setShowGridSummary(true);

Clicking this icon ends up with error call to IDACall.
I'm using custom RestDataSource optimized to php on server side.

How can I hide this icon or add custom functionality to this??
I don't see anything in docs

Best regards

// EDIT
This shows when you use custom DataSource for fetching summary information by:

queueList.setSummaryRowDataSource(dsSummary);