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The inputbasemode tag is the key to getting buttons to look right. In DX2, the default inputbasedmode is 'Menu', this is the base mode you see in standard menus such as the Save Menu, Load Menu, Security Terminal, Start Screen, Options, and any other simple menus in the game that basically only require navigation, selections, and exiting button input.

Typical buttons used in the inputlayer named 'Menu' include the following:
MenuSelect - [MenuSelect]
MenuBack - [MenuBack]
MenuUp - [MenuUp]
MenuLeft - [MenuLeft]
MenuRight - [MenuRight]
MenuDown - [MenuDown] D-Pad Left Right - [LeftRight] D-Pad Up Down [Arrows]

Non-simple menus would be menus like 'InventoryMenu', 'BiomodInstallMenu', and 'DatavaultMenu'. For the most part, the mappings here will be the same. There is an inputbasemode called 'InventoryMenu' made just for this. It is basically, the normal menu plus recognition of the black and white buttons that open datavault or biomods.

Those extra special menu buttons are as follows:
ToggleBiomodMenu - [ToggleBiomodMenu]
ToggleDataVaultWindow - [ToggleDataVaultWindow]
ThrowItem - [ThrowItem]

Last but not least, there is the inputbasemode called 'Game'. Use this to describe buttons that are active when the game is playing... when no menu is up.
Frob - [Frob]
UseItem - [UseItem]
AltFire - [AltFire]
Crouch - [Crouch]
Jump - [Jump]
ToggleInventoryMenu - [ToggleInventoryMenu]
ToggleBiomodMenu - [ToggleBiomodMenu]
ToggleDataVaultWindow - [ToggleDataVaultWindow]
Menu - [Menu]
MenuUp - [MenuUp]
MenuLeft - [MenuLeft]
MenuRight - [MenuRight]
MenuDown - [MenuDown]