The Selection Filter allows you to define how you want
to select items, and what types of items you wish to choose from. For
example, depending on the command, you may choose from single item, window,
group, or complete layer selections, as well as restricting your selections
to particular layers and/or D-codes, etc.
When you are not in a command that uses the Selection Filter, the text in the Selection Filter is gray and you cannot select any options. You also do not have the option of using the View|Selection Filter command or the F hotkey when not in a function that uses the Selection Filter.
You can close the display at any time by clicking on the X in the upper-right
corner. If you undock the Selection Filter from the VisualCAM window while
not in a function that uses it, it will disappear. It will automatically
appear again when a function requires it. You can expand the size of the
bar to the entire height of the workspace by clicking the up-arrow; then
reduce its size by clicking the down-arrow. While it is docked in the
VisualCAM window, you can resize the height and width of the bar by moving
your cursor to one of its outer edges. When the cursor changes to 
, click and hold the left mouse button while you drag the
edge to the desired size.
Mode
These options define how items are selected. The available modes depend upon the function you are in. When you are in Item select mode, a bounding box is added to the cursor. Anything that falls within this bounding box is a potential selection. You can increase the size of the box by pressing the PgUp hotkey, or decrease the size (for increased accuracy) by pressing the PgDn hotkey. If more than one item exists at the point you select, the Choose Selection dialog box appears.
In Window select mode, everything that falls completely within your selection window is selected. In Window +Xing mode, everything inside the selection window, including anything that the window touches, is selected.
In Layer select mode, all selected types of data on all selected layers are chosen.
Types
These options allow you to select which kinds of items will be included. Any type of item not checked will be excluded from selection.
Layers
These options allow you to select which layers will be considered when choosing items.
D-Codes
These options allow you to specify items that are created using only a particular D-code.
Tools
These options allow you to specify drill or mill items that are created using a particular NC tool.
Polarity
These options allow you to specify only items with a particular polarity.