On moving the cursor on and around the boundary of the Text box, the cursor takes the ARROW shape. Inside the Text box, the cursor is displayed as the Dotted IBEAM. If you now click inside the Text box with this Dotted IBEAM cursor, the cursor shape changes to IBEAM and a caret appears at the empty Text box is in Text Edit mode and this is positioned at mouse click. The text box boundary from gray to black.