For tree views and lists, this method retrieves a column value from the currently selected element.
GetValueFromCurrentItem( column-name )
The required Column-name is the Label or Name of a node column of the currently selected element in the tree view or list view, as specified in the SELECT list of the node's SQL Query.
The first column in the SELECT output list is always the one that is displayed. If you want to retrieve the displayed value of the current item, you can use the constant 'value' for column-name.
MessageInformation( Tree_View_1.GetValueFromCurrentItem( address ) )