Improve render of bone-tree panel
Improve render of bone-tree panel

kerryChen95/AlloyStick,kerryChen95/AlloyStick,AlloyTeam/AlloyAnimation,AlloyTeam/AlloyAnimation,AlloyTeam/AlloyAnimation,kerryChen95/boneAnimationEditor,AlloyTeamDev/AlloyAnimation,kerryChen95/boneAnimationEditor,AlloyTeamDev/AlloyAnimation,kerryChen95/boneAnimationEditor,AlloyTeamDev/AlloyAnimation