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**PROP:Child** is an array property which returns the control number (e.g., Field Equate number) of a child control in a parent control structure (such as a SHEET, TAB, OPTION, or GROUP). (READ ONLY) The element number (array index into the property) is the ordinal position of the control in the parent structure. Returns null string ('') if the element number is out of range. //?Sheet{Prop:Child,Choice(?Sheet)}// is equivalent to using //?Sheet{Prop:ChoiceFEQ}//.

**PROP:ChildIndex** is an integer property which returns the ordinal position of all the child controls in a parent control structure (such as a SHEET, TAB, OPTION, or GROUP). (READ ONLY) The element number is the control number of the control in the parent structure. Returns a null string ('') if the element number is out of range.

**PROP:ChildIndex** is normally used with the child control Field Equate Label. Use the **PROP:Parent** property to determine the parent control's Field Equate Label.

**Example:**

| Chld    PROCEDURE |
| optvar1 string(32) |
| Label   STRING('Test') |
|  |
| WinView     WINDOW('Child One'),SYSTEM,MAX,AT(0,0,141,106),MDI,FONT('Microsoft Sans Serif', 10,,, CHARSET:DEFAULT),HVSCROLL |
| STRING('String1'), AT(2,2), USE(Label) |
| OPTION('Option 1'), AT(0,17,103,41), USE(OptVar1), KEY(F10Key), HLP('Option1Help') |
| RADIO('Radio 1'), AT(0,17,42,20), USE(?R1) |
| RADIO('Radio 2'), AT(2,37,40,20), USE(?R2) |
| END |
|  |
| END |
|  |
| CODE |
| OPEN(WinView) |
| LOOP X# = 1 TO 99 |
| Y# = ?OptVar1{PROP:Child,X#} |
| IF NOT Y# |
| BREAK |
| END |
| EXECUTE X# |
| Z# = ?R1{PROP:ChildIndex} |
| Z# = ?R2{PROP:ChildIndex} |
| END |
| MESSAGE('Radio ' & Z# & ' is field number ' & Y#) |
| END |
| ACCEPT |
| END |
|  |
| **!Example of usage with a sample SHEET control** |
|  |
| **SHEET,AT(5,177,133,123),USE(?Sheet1)** |
| **TAB('Tab Alpha'),USE(?TabAlpha)** |
| **END** |
| **TAB('Tab Bravo'),USE(?TabBravo)** |
| **END** |
| **TAB('Tab Charlie'),USE(?TabCharlie)** |
| **END** |
| **END** |
|  |
|  |
| **?Sheet1{PROP:Child,****//Nth//****}** |
| **!returns the Field Equate of the ****//Nth//**** tab in the sheet.** |
|  |
| **TabFeq = ?Sheet1{PROP:Child,2}** |
| **!is equivalent to** |
| **TabFeq=?TabBravo** |
|  |
| **SELECT(?TabBravo)** |
| **!is equivalent to** |
| **SELECT(?Sheet1{PROP:Child,2})** |
|  |
| **?Sheet1{PROP:Child,CHOICE(?Sheet1)}** |
| **!is equivalent to** |
| **?Sheet1{PROP:ChoiceFEQ}** |
|  |
| **!get FEQ of the last tab:** |
| **LastFEQ = ?Sheet1{PROP:Child,(?Sheet1{Prop:NumTabs})}** |
|  |
| **!get FEQ of the first tab** |
| **?Sheet1{Prop:Child, 1 }** |
|  |
| **!Does the next tab on the sheet exist and not hidden?** |
| **IF CHOICE(?Sheet1) <; ?Sheet1{Prop:NumTabs} AND** |
| **(?Sheet1{PROP:Child,CHOICE(?Sheet1)+1}){PROP:Hide} <;> TRUE** |

**See Also:** [[prop parent.htm|PROP_Parent]]