▪MG-Select Helper:

It is tool window that stores your temporary selection, serves a selection assistant.

You could have any number of select helper windows opened at the same time.

To bring up a new helper window, you have two ways:

1.LMB click on the top right more feature button , select "New Selection Helper..".

2.CTRL / SHIFT RMB clicking on a select-button, the member view will pop up, click on the tear off button at the bottom right corner to tear the window off, make it into a select helper window.

Use "=" button to replace the content with maya selection, "+" to add maya selection into the window, "-" to remove the maya selection from the window.

Press "Select All" button to select all the member objects in the select-buttons in the view, hold Ctrl key while pressing it to deselect the members,

Ctrl+Shift key to add members to current selection, Shift to invert selection.

Toggle on / off the "NS" to toggle the display of the namespace in the view.