Convert to using a Theme Style Sheet.

Author: MelvMay-Unity

LowLevel/Sandbox/Assets/Sandbox/UI/Common/DefaultDark.tss

@@ -12,7 +12,7 @@ MonoBehaviour:
   m_Script: {fileID: 19101, guid: 0000000000000000e000000000000000, type: 0}
   m_Name: PanelSettings
   m_EditorClassIdentifier: 
-  themeUss: {fileID: 11400000, guid: a428398971386994caaaf16c35d6b22d, type: 2}
+  themeUss: {fileID: -4733365628477956816, guid: 8f8f30c5b18fe7e47bdf2ed0299bf9f8, type: 3}
   m_DisableNoThemeWarning: 0
   m_TargetTexture: {fileID: 0}
   m_RenderMode: 0

LowLevel/Sandbox/Assets/Sandbox/UI/Common/DefaultDark.tss.asset

@@ -65,7 +65,19 @@ MonoBehaviour:
       - rid: 3844551955710476546
       - rid: 3844551955710476547
     m_RuntimeSettings:
-      m_List: []
+      m_List:
+      - rid: 3844551955710476519
+      - rid: 3844551955710476521
+      - rid: 3844551955710476523
+      - rid: 3844551955710476527
+      - rid: 3844551955710476529
+      - rid: 3844551955710476530
+      - rid: 3844551955710476533
+      - rid: 3844551955710476536
+      - rid: 3844551955710476539
+      - rid: 3844551955710476540
+      - rid: 3844551955710476541
+      - rid: 3844551955710476544
   m_AssetVersion: 9
   m_ObsoleteDefaultVolumeProfile: {fileID: 0}
   m_RenderingLayerNames:

LowLevel/Sandbox/Assets/Sandbox/UI/Common/DefaultDark.tss.asset.meta

@@ -1,2 +1,2 @@
 m_EditorVersion: 6000.3.0a5
-m_EditorVersionWithRevision: 6000.3.0a5 (634d97cb170d)
+m_EditorVersionWithRevision: 6000.3.0a5 (4de4b9a9d84c)