Is it possible to bind buttons in sliding menu (the one that appears when you click the top right button) to do custom things?

For example, I made a new button and I wanted it to connect to a community server, but the button simply did not do anything.

Here's the MvM button code from this menu:

"MvMEntry"
	{
		"ControlName"	"CPlayListEntry"
		"fieldName"		"MvMEntry"
		"xpos"			"0"
		"ypos"			"103"
		"tall"			"45"
		"wide"			"255"
		"proportionaltoparent"	"1"

		"image_name"		"main_menu/main_menu_button_mvm"
		"button_token"		"#MMenu_PlayList_MvM_Button"
		"button_command"	"play_mvm"
		"desc_token"		"#MMenu_PlayList_MvM_Desc"
		"matchgroup"		"1" // k_eTFMatchGroup_MvM_MannUp

		if_event
		{
			"ypos"			"153"
		}
	}

This is what I added:

"AdditionalButtonTHG"
	{
		"ControlName"	"CPlayListEntry"
		"fieldName"		"AdditionalButtonTHG"
		"xpos"			"0"
		"ypos"			"153"
		"tall"			"45"
		"wide"			"255"
		"proportionaltoparent"	"1"

		"image_name"		"casual/gametype_arena"
		"button_token"		"#MMenu_PlayList_THG_Button"
		"button_command"	"engine connect 87.98.254.85:27015"
		"desc_token"		"#MMenu_PlayList_THG_Desc"
		//"matchgroup"		"0" // k_eTFMatchGroup_MvM_MannUp

		if_event
		{
			"ypos"			"153"
		}
	}

Also I noticed that the same buttons (for example, create server button) would have different commands in main menu and in this sliding panel

Sliding panel:

"button_command"	"create_server"

Main menu:

"command" "OpenCreateMultiplayerGameDialog"

So it there any way to make normal commands like connect, bind, etc work in this panel? Thanks in advance