With this command all function blocks are displayed in a dialog box. You can choose whether to have a list displaying user-defined or standard function blocks.
If one of the function blocks is selected and the dialog box is closed with OK, then the highlighted function block will be inserted at the current cursor position. (This is managed here just as it is in the input assistant).
If the 'With arguments' option was selected in the dialog box, then the necessary input variables of the function block will also be inserted. However you are not forced to assign these parameters.