Before the linkbox is expanded, the button's width is expected.

After the linkbox is expanded, the button is scaled unexpected.

I essentially used the below code snippet to create the button and linkbox in NodeData::GetDDescription()

Int32 groupID = xxgroupIdxx;
const DescID groupDescID = CreateDescID(DescLevel(groupID, DTYPE_GROUP, 0));
{
    BaseContainer bc = GetCustomDataTypeDefault(DTYPE_GROUP);
    bc.SetInt32(DESC_COLUMNS, 2);
    bc.SetInt32(DESC_SCALEH, TRUE);
    description->SetParameter(groupDescID, bc, CreateDescID(DescLevel(AOV_COMP_PARAMS_GRP)));
}

{
    DescID id = CreateDescID(DescLevel(xxButtonIdxx, DTYPE_BUTTON, 0));
    BaseContainer bc = GetCustomDataTypeDefault(DTYPE_BUTTON);
    bc.SetString(DESC_NAME, "test"_s);
    bc.SetInt32(DESC_CUSTOMGUI, CUSTOMGUI_BUTTON);
    bc.SetBool(DESC_SCALEH, FALSE);   //// <<<<<<<<<<<
    bc.SetBool(DESC_FITH, TRUE);      ////  <<<<<<<<<<<< I have tried using these two flags, but they don't help
    description->SetParameter(id, bc, groupDescID);
}

{
    const DescID id = CreateDescID(DescLevel(xxLinkIdxx, DTYPE_BASELISTLINK, 0));
    BaseContainer bc = GetCustomDataTypeDefault(DTYPE_BASELISTLINK);
    bc.SetString(DESC_NAME, "test"_s);
    bc.SetInt32(DESC_CUSTOMGUI, CUSTOMGUI_LINKBOX);
    bc.SetData(DESC_SCALEH, TRUE);
    bc.SetContainer(DESC_ACCEPT, accept);
    description->SetParameter(id, bc, groupDescID);
}

Thanks!