Sorting Report

Need help on sorting a simple report.
Simple list of Stock Item Name with two button to sort Desc and Ascending order.


;;----------------------------------------------------------------
;;-------- Report Sorting Test -----------------------------------
;-----------------------------------------------------------------

[#Menu: Gateway of Tally]
Item: Stock List Report : Display : MyStockList

[Report: MyStockList]
Form : MyStockList
Variable : SortOrder

[Form: MyStockList]
Part: DSP MyTitle, DSP MyStockList
Width : 100% Page
Height : 100% Page

Button : SortDec, SortAsc

[Part: DSP MyTitle]
Line : MyTitle

[Line: MyTitle]
Field : StkItem

[Field: StkItem]
Use : Simple Field
Wdith : 100
Set as : "Stock Item Name, Sorting - " + $$String:##SortOrder
Border : Thin Bottom

[Part: DSP MyStockList]
Line : MyItem
Repeat : MyItem : ColStockItem
Scroll : Vertical

[Line: MyItem]
Field : MyItemName

[Field: MyItemName]
Use : Simple Field
Wdith : 100

Set as : $Name

[Button: SortDec]
Key : F5
Title : "Desc"
Action : Set : SortOrder : 0

[Button: SortAsc]
Key : F6
Title : "Asc"
Action : Set : SortOrder : 1

[Collection: ColStockItem]
Use : Stock Item

Compute : SortColumn : ##SortOrder
Sort : 0 : $Name
Sort : 1 : -$Name


[System: Variables]
SortOrder : ($$SysName:NotApplicable)

[Variable: SortOrder]
Type : Number
Volatile: Yes
Default : 0