4.8.2. Marking single components<br>

### 4.8.2. Marking single components

To be able to perform any operation on a component, such as move, delete, data change, etc., you must mark that component.

¨ To mark an existing component:

1. Enable the mode of selecting (marking) components, if it is not enabled already. The component selection mode is the default mode. The black arrow button on the toolbar should be depressed, and the mouse pointer must have the form of a cross.

2. Position the pointer on the component and click the left mouse button.

After marking the component it is highlighted, for instance by making its contour thicker or by changing its colour, and a message is displayed on the status bar informing that the component has been selected. If the data table is displayed, the data fields of the selected component appear.

! Every component upon inserting it is automatically marked. Inserting another component cancels that marking.

! When marking a polyline clicking on one of its segments marks that segment only. To mark entire length of a polyline double click any fragment of it.

You can mark a component which is obscured by another component placed on top of it.

¨ To mark a component obscured by another:

1. Click the component which is “on top”; this component becomes marked.

2. Press and hold the Ctrl key.

3. While keeping the Ctrl key depressed, click the component which is underneath (within the area which is shared by the two components).

4. Release the Ctrl key.

5. The component “on top” will be unmarked and the component “underneath” will be marked.

¨ To unmark a component click a point within the workspace where there is no component. The status line should then display “Selected: ---”. You can also use the “Unmark all components” function ().