No way to obtain refs to the underlying HTML elements without `ReactDOM.findDOMNode`

[christopherbot]

My motivation for wanting a way to reference the underlying HTML elements of the Dropdown components is to enhance the scrolling functionality of my DropdownMenu implementation.

I have added arrow buttons to the top and bottom of my DropdownMenu that appear when there is hidden content in those directions. When clicked, I want these buttons to cause the the DropdownMenu to scroll in that direction by a certain amount.

I have the behaviour working using ReactDOM.findDOMNode but I would like to use a callback ref instead (coming from the discussion in this issue).

I believe a simple solution is for the DropdownMenu component to accept an onRef prop that forwards to the Component (seen below), something like ref={this.props.onRef} underneath style={style}:

react-dropdown/src/DropdownMenu.jsx

Lines 113 to 122 in abede6c

	<Component
	{...props}
	role="menu"
	className={cx(className, {
	[styles.dropdownMenu]: true,
	[styles.selected]: activeMenuItems.length > 0,
	[styles.pullRight]: !!pullRight
	})}
	style={style}
	>

Are you open to something like this?