As a last resort you can look at the mapping extension's daml definitions here (assuming you did a default install):
But before that you can try to use this option in ArcGIS Pro: under ‘Customize the Ribbon’ check the "Show command IDs" option. Now when you hover with your mouse over a button you should see the ID displayed:
I looked up the split button for the Explore control. Here is the id:
<splitButton id="esri_mapping_exploreSplitButton" keytip="E" extendedCaption="Open current explore tool">
<tool refID="esri_mapping_exploreTool" />
<button refID="esri_mapping_infoTopmostLayerButton" />
<button refID="esri_mapping_infoAllLayersButton" />
<button refID="esri_mapping_infoSelectableLayersButton" />
<button refID="esri_mapping_infoSelectedTOCButton" />
<button refID="esri_mapping_infoNoneButton" />
<button refID="esri_mapping_screenPlanePanButton" separator="true" />
<button refID="esri_mapping_firstPersonModeButton" />
Thank you both for your responses. This is very helpful.
In addition, i am trying to figure out the id of the context menu that is opened with you right-click when you have the explore tool active. We would like to add a tool to that list. I've tried several of the context menu ids that I found in the Daml constants but they didn't seem to work
I looked in the customize ribbon dialog and couldn't find a way to find the id of the context menu that way.