AUI_CONTROL refinement: When using opcode CTLOP_CLR, you may now set the MBST_TEXTONLY flag in the cstate parameter to cause it to clear the text from any affected control, rather than delete the control entirely. This is mainly useful with controls containing data in a form, where you want to clear the data but leave the form. Note that in such a case, you will probably want to protect the label controls from being cleared, which you can do by creating them with the MBF_DIM attribute set, and using TAB(-1,13) to enable protection immediately prior to the AUI_CONTROL, CTLOP_CLR operation. Use TAB(-1,14) afterward to disable protection.
For example, to clear the text from the unprotected controls, and leave the protected controls alone (in the region of rows 1-24 and cols 1-80):
? tab(-1,13); ! enable protection
xcall AUI, AUI_CONTROL, CTLOP_CLR, NUL_CTLID, "*", MBST_TEXTONLY, NUL_CTYPE, NUL_CMD$, NUL_FUNC$, 1, 1, 24, 80
? tab(-1,14); ! disable protection
Note that the "*" in the ctext parameter is required to select all the controls.
