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... ; [ <lHScroll: HSCROLL> ] ; [ <readonly: READONLY, NO MODIFY> ] ; [ WHEN <uWhen> ] ; [ VALID <uValid> ] ; [ ON CHANGE <uChange> ] ; [ <lDesign: DESIGN> ] ; [ <lHighlight: HIGHLIGHT> ] ; [ <file: FILE, FILENAME> <cFileName> ] ; [ RTFSIZE <nRTFSize> ...

... <.lDesign.>, [\{<cPrompt>\}], ; <ntabheight>, [\{<cnHelpids>\}], <nRound>, [{|nOption, nOldOption, Self | <uChange>}],; [{|Self,nOption| <uPaint>}], [{|Self,nOption| <uPaintxt>}], ; [\{<nAlign>\}], <.lAdjust.>, <nSep>, <nOption>, ...

... ; [ <lHScroll: HSCROLL> ] ; [ <readonly: READONLY, NO MODIFY> ] ; [ WHEN <uWhen> ] ; [ VALID <uValid> ] ; [ ON CHANGE <uChange> ] ; [ <lDesign: DESIGN> ] ; [ <lHighlight: HIGHLIGHT> ] ; [ <file: FILE, FILENAME> <cFileName> ] ; [ RTFSIZE <nRTFSize> ...

... ; [ <lHScroll: HSCROLL> ] ; [ <readonly: READONLY, NO MODIFY> ] ; [ WHEN <uWhen> ] ; [ VALID <uValid> ] ; [ ON CHANGE <uChange> ] ; [ <lDesign: DESIGN> ] ; [ <lHighlight: HIGHLIGHT> ] ; [ <file: FILE, FILENAME> <cFileName> ] ; [ RTFSIZE <nRTFSize> ...

... ] ; [ ID <nId> ] ; [ <dlg:OF,WINDOW,DIALOG> <oWnd> ] ; [ <help:HELPID, HELP ID> <nHelpId> ] ; [ ON CHANGE <uChange> ] ; [ VALID <uValid> ] ; [ <color: COLOR,COLORS> <nClrText> [,<nClrBack>] ] ; [ <update: UPDATE> ] ; [ MESSAGE ...

... CENTER, CENTERED> ] ; [ <lRight: RIGHT> ] ; [ <readonly: READONLY, NO MODIFY> ] ; [ VALID <uValid> ] ; [ ON CHANGE <uChange> ] ; [ <lDesign: DESIGN> ] ; [ <lNoBorder: NO BORDER, NOBORDER> ] ; [ <lNoVScroll: NO VSCROLL> ] ; [ <INFIELDCAPTION ...

... STRETCH> ] ; [ POPUP <upop>]; [ ALIGN <nAlign,...> ] ; [ ACTION <uAction> ]; [ BRIGHT <nBright> ] ; [ ON CHANGE <uChange> ] ; [ ON PAINT TAB <uPaint> ]; [ ON PAINT TEXT <uPaintxt> ]; [ HELPTOPICS <cnHelpids,...> ] ; [ <layout: TOP, LEFT, ...

... PIXEL, PIXELS > ] ; [ FONT <oFont> ] ; [ <pict: PICT, PICTURE> <cPict> ] ; [ <pass: PASSWORD> ] ; [ ON CHANGE <uChange> ] ; [ ON UPDATE <uUpdate> ] ; [ ON SCROLL <uScroll> ] ; [ <lRO: READONLY> ] ; [ <lRight: RIGHT> ] ; [ <lCenter: ...

... <oCursor> ] ; [ <pixel: PIXEL> ] ; [ MESSAGE <cMsg> ] ; [ <update: UPDATE> ] ; [ WHEN <uWhen> ] ; [ ON CHANGE <uChange> ] ; [ <help:HELPID, HELP ID> <nHelpId> ] REDEFINE DTPICKER [ <oDTPicker> VAR ] <uVar> ; [ ID <nId> ] ; [ <dlg: ...

... <oCursor> ] ; [ <pixel: PIXEL> ] ; [ MESSAGE <cMsg> ] ; [ <update: UPDATE> ] ; [ WHEN <uWhen> ] ; [ ON CHANGE <uChange> ] ; [ <help:HELPID, HELP ID> <nHelpId> ] REDEFINE DTPICKER [ <oDTPicker> VAR ] <uVar> ; [ ID <nId> ] ; [ <dlg: ...

... ; [ <lHScroll: HSCROLL> ] ; [ <readonly: READONLY, NO MODIFY> ] ; [ WHEN <uWhen> ] ; [ VALID <uValid> ] ; [ ON CHANGE <uChange> ] ; [ <lDesign: DESIGN> ] ; [ <lHighlight: HIGHLIGHT> ] ; [ <file: FILE, FILENAME> <cFileName> ] ; [ RTFSIZE <nRTFSize> ...

... ] ; [ ID <nId> ] ; [ <dlg:OF,WINDOW,DIALOG> <oWnd> ] ; [ <help:HELPID, HELP ID> <nHelpId> ] ; [ ON CHANGE <uChange> ] ; [ VALID <uValid> ] ; [ <color: COLOR,COLORS> <nClrText> [,<nClrBack>] ] ; [ <update: UPDATE> ] ; [ MESSAGE ...

...               [<lNoURL: URL> NO];               [WHEN <uWhen>];               [VALID <uValid>];               [ON CHANGE <uChange>]

... ] ; [ ID <nId> ] ; [ <dlg:OF,WINDOW,DIALOG> <oWnd> ] ; [ <help:HELPID, HELP ID> <nHelpId> ] ; [ ON CHANGE <uChange> ] ; [ VALID <uValid> ] ; [ <color: COLOR,COLORS> <nClrText> [,<nClrBack>] ] ; [ <update: UPDATE> ] ; [ MESSAGE ...

Norberto,

"Self" is provided as a parameter of the ON CHANGE codeblock, so you could use ::nAt

[{|Self|<uChange>}]

oComb is not defined yet (you are using it before it has been assigned, thats why you get NIL:

Error BASE/1004 Class: 'NIL' has no exported method: NAT