Name

Type

Optional

Meaning

hwnd

Number

No

Handle of the dialog containing the control

ctrlID

Number

No

Control identifier

DummyString

String

Yes

---Not used--- Leave blank

xPos

Number

No

Horizontal position of the control inside the dialog

yPos

Number

No

Vertical position of the control inside the dialog

Width

Number

No

Control width

Height

Number

No

Control height

Style

Number

Yes

Primary style of the control. See TRACKBAR Style equates.

If no style has been specified, the following will be assumed as default:

%WS_CHILD Or %WS_VISIBLE

ExStyle

Number

Yes

Extended style of the control. See TRACKBAR ExStyle equates.

CallBack

Function

Yes

Optional name of a Callback Function that receives all %WM_COMMAND and %WM_NOTIFY messages for the control.

If the Callback Function processes a message, it should return %TRUE (non-zero) to prevent the message being passed unnecessarily to the dialog callback (if one exists).

The dialog callback should also return %TRUE if the notification message is processed by that Callback Function.