Lookup Form

Here in this example demonstrates how to make a look up form for a sub categories regarding to the selected category in grid and you can do the same for any controls.

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AssetComponentsTable: the items table
AssetComponentsGroup: the group field  CompGroupId
AssetComponentsSubGroup: the sub group field CompSubGroupId

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Note: In the grid control the field of CompGroupId make the AutoDeclaration true
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public void lookup()
{

//    super();

QueryBuildDataSource qbds;
Query q = new Query();
QueryBuildRange qbr;


SysTableLookup s =  SysTableLookup::newParameters(tableNum(AssetComponentsSubGroup),this);
s.addLookupField(fieldnum(AssetComponentsSubGroup,CompSubGroupId));
s.addLookupField(fieldnum(AssetComponentsSubGroup,Name));

qbds = q.addDataSource(tableNum(AssetComponentsSubGroup),"AssetComponentsSubGroup");
qbr  = qbds.addRange(fieldnum(AssetComponentsSubGroup,CompGroupId));

qbr.value(AssetComponentsTable.CompGroupId);

s.parmQuery(q);
s.performFormLookup();
}