parentConfiguration

onCreate = {
    // Does additional stuff before parent configuration's onCreate.
    ...
    // parentConfiguration?.onCreate invocation can be skipped too.
    parentConfiguration?.onCreate?.invoke(this)
    // Waits for parent configuration onCreate to finish, then does additional stuff.
    ...
}

// Extend dock behavior only and only if parent defines dock.
dock = impl@{
    val parentDock = parentConfiguration?.dock as? Dock ?: return@impl null
    val updatedListBuilder = parentDock.listBuilder.modify {
        addFirst { Dock.Button.rememberElementsLibrary() }
    }
    remember(parentDock, updatedListBuilder) {
        parentDock.copy(listBuilder = updatedListBuilder)
    }
}

// Add inspector bar no matter parent defines or not. If it is defined, then extend it.
inspectorBar = {
    // If parent configuration does not have an inspector bar, create an empty one as source.
    val sourceInspectorBar = parentConfiguration?.inspectorBar as? InspectorBar ?: InspectorBar.remember()
    val updatedListBuilder = sourceInspectorBar.listBuilder.modify {
        addLast { InspectorBar.Button.rememberCrop() }
    }
    remember(sourceInspectorBar, updatedListBuilder) {
        sourceInspectorBar.copy(listBuilder = updatedListBuilder)
    }
}