Mapkey for materials - "set as master" issue

This is for Creo 7. We have mapkeys tied to buttons in the GUI that allow users to very quickly pick some of our more common materials.

They work great the first time but one of the issues is the "set as master". If a user clicks on the mapkey a second time however the material changes to be PTC_SYSTEM_MTRL_PROPS. It appears that everytime you invoke "set as master"

mapkey(continued) ~ PopupOver `finder` `listPopup` 1 `FFileListPHLay.Filelist`;\
mapkey(continued) ~ Open `finder` `listPopup`;~ Close `finder` `listPopup`;\
mapkey(continued) ~ Activate `finder` `FAddPushLib`;

it toggles  between the material you meant to assign and the PTC system material.

Anyone figured out a way around this so it doesn't toggle the PTC system material? Obviously training is an option. I could tell users to put the material in a tree column or just to pull up the assign material dialog box and check before pushing the button but the goal here is to make their lives easier with less clicks.

Full mapkey:

mapkey matABC @MAPKEY_NAMEAssign ABC as the material;@MAPKEY_LABELABC;\
mapkey(continued) ~ Activate `main_dlg_cur` `page_Model_control_btn` 1;\
mapkey(continued) ~ Close `main_dlg_cur` `appl_casc`;~ Command `ProCmdMmModelProperties` ;\
mapkey(continued) ~ Activate `mdlprops_dlg` `MATERIAL_lay_Controls.push_Change.lay_instance`;\
mapkey(continued) ~ Input `finder` `opt_EMBED_BROWSER_TB_SAB_LAYOUT` \
mapkey(continued) `A:\\FolderPath\\ABC.mtl`;\
mapkey(continued) ~ Update `finder` `opt_EMBED_BROWSER_TB_SAB_LAYOUT` \
mapkey(continued) `A:\\FolderPath\\ABC.mtl`;\
mapkey(continued) ~ Activate `finder` `opt_EMBED_BROWSER_TB_SAB_LAYOUT`;\
mapkey(continued) ~ RButtonArm `finder` `FFileListPHLay.Filelist` `ABC.mtl`;\
mapkey(continued) ~ PopupOver `finder` `listPopup` 1 `FFileListPHLay.Filelist`;\
mapkey(continued) ~ Open `finder` `listPopup`;~ Close `finder` `listPopup`;\
mapkey(continued) ~ Activate `finder` `FAssignPushLib`;~ Activate `UI Message Dialog` `ok`;\
mapkey(continued) ~ Activate `UI Message Dialog` `ok`;~ Activate `UI Message Dialog` `no`;\
mapkey(continued) ~ Activate `finder` `FOkPush`;\
mapkey(continued) ~ Activate `mdlprops_dlg` `DlgClose_push`;