Grid collapse and expand API:
sample-data
collapsed_specified_group
random-3x10
random-100x2k
collapseAllOnInit
null
true
false
collapseAllVisible
rowNumberVisible
expandAllRows()
collapseAllRows()
toggleAllRows()
expandRow("level_0")
collapseRow("level_0")
toggleRow("level_0")
expandRowLevel(0)
expandRowLevel(1)
expandRowLevel(2)
expandRowLevel(3)